Supernatural's Sera Gamble has revealed new details about the seventh season.

The showrunner told TV Line that Sam (Jared Padalecki) will struggle to hold on to sanity as his memories of Hell return.

"What's happening with Sam isn't anything he can hide for very long," she said. "It comes out pretty quickly that he is dealing with this awful... situation, which escalates really, really dramatically in [episode 2]."

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She added: "[Sam's] facing that moment as a hunter where he's been through so much, he might just be losing his marbles for good."

Gamble also confirmed that Sam's brother Dean (Jensen Ackles) will have "lots of issues" to deal with in future episodes.

"[It's a] rockier journey… of how he feels emotionally than in the past," she explained. "Dean is in a different place than he's been in previous seasons."